Camber grinding machines



Sept; 22, 1959 s. w. DRONSFIELD CAMBER GRINDING MACHINES Filed Feb. 15.1956 3 Sheets-Sheet l Inven or smuu W/ZIr'IMQW 0mm? 40 P 1959 s. w.DRONSFIELD 2,904,935

CAMBER GRINDING MACHINES Filed Feb. 13, 1956 3 Sheets-Sheet 2 A torney)Sept. 22, 1959 s, w, DRONSFIELD 2,904,935

CAMBER GRINDING MACHINES Filed Feb. 13, 1956 3 Sheets-Sheet 3 Fig.1

ventor l n 5'14 1 PM 47/1 39 PRU/1599570 CAMBER GRINDING MACHINES SamuelWilkinson Dronsfield, Chelford, Macclesfield, England, assignor toDronsfield Brothers Limited, Oldham, England, a British company 1"Application February 13, 1956, Serial No. 565,155

Claims priority, application Great Britain a February 18, 1955 8 Claims.(Cl. 51 -49) The present invention relates to camber grinding machinesfor imparting to a generally cylindrically body, such as a calenderroll, a slightly convex contour in the lengthwise direction.

Such a convex contour is generally referred to as a camber and will beso referred to herein and in the appended claims.

In machines adapted for cambering rolls as aforesaid it is known for agrinding head to follow a stationary contoured track in the form of atemplate extending parallel with the roll to impart the required camberto the roll. The length of the template corresponds with that of theroll and it is therefore difficult and expensive to prepare.

. In some more modern camber grinding machines a template is dispensedwith and the transverse position of the grinding head relatively to thework is controlled by a rotatable control element which is driven byvirtue of the relative traversing movement of the grinding head and thework as the grinding operation proceeds. In such machines the camberfeed is usually achieved by an automatic tilting or angular movement ofa grinding head table which is mounted on a slide which may itself bemanually adjusted transversely of the work. The drawback with such anarrangement is that the rate of automatic transverse camber feed is notdirectly proportional to the rate of angular displacement of thegrinding head and will in part be a function of the grinding wheeldiameter which decreases with use thereof. Thus the calculationsinvolved in setting up a machine to grind a given camber are rathercomplicated.

A camber grinding machine has been proposed in which the work istraversed past the grinding head, the grinding head being linearlyslidable transversely of the work. This machine involves two linearlyguided slides, namely an upper grinding head slide which can be manuallyadjusted relatively to an intermediate slide which is automaticallyadjusted by a rotatable control element to atford a camber feed. Eventhough this machine has the advantage that the camber feed is linearinstead of angular it suffers from the disadvantage of an intermediateslide between the grinding head slide and the machine bed, producing acumulative inaccuracy resulting from two sets of slide clearances ofsuch magnitude that the use of a tilting grinding head table has inpractice usually been preferred.

' An object of the present invention is to produce a grinding machine inwhich the required camber grinding accuracy may be obtained using alinearly fed grinding head whose camber feed towards the work isautomatically. controlled by relative traversing movement of thegrinding head and the work.

1 A further object 'of the invention is the provision of acamber'grinding machine in which the degree of camber to .be imparted toa roll may be rapidly and easily changed, and yet accurately controlled.

Other objects and features of the present invention will appear morefully below from the following detailed de- Patented Sept. 22, 1959scription considered in connection with the accompanying drawings whichdisclose one embodiment of the invention.

' It is to be expressly understood, however, that the drawings aredesigned for purposes of illustration only and not as a definition ofthelimits of the invention, reference for the latter purpose being hadto the appended claims.

In the accompanying drawings:

Fig. 1 is an end sectional view illustrating a grinding machineaccording to the invention,

Fig. 2 is an enlarged sectional view of a portion of Fig. 1,

Fig. 3 is a plan view of a detail of the machine of 1 Figs. 1 and 2 andFig. 4 is a fragmentary sectional view on the line VV of Fig. 3.

In the embodiment illustrated a carriage 101 is mounted on guides of amachine bed 102. The grinding head slide 103 is directly supported onthe carriage 101 for sliding movement transversely of the work. Agrinding head including a grinding wheel 104, indicated by broken lines,is mounted on the slide 103. The grinding head slide 103 can be adjustedrelatively to a connecting block 105 by means of a handwheel 106 and itsassociated feed screw 107. The position of the connecting block 105transversely of the bed 102 is controlled bythe camber mechanism. Thefeed screw 107 co-operates with two spring separated nuts 108 in theslide 103. The spring separation eliminates back-lash between the feedscrew and the slide.

The camber mechanism is mounted in a housing 109 which is attached tothe carriage 101. This mechanism which is shown in detail in Fig. 2 hasan eccentric 110 of variable throw which engages a bearing opening in aslide block 111 which is slidably mounted in a downwardly directedguideway comprising a slot in an inverted channel member in the form ofa fixed block 112 attached to the connecting block 105. The blocks 111and 112 are capable of relative movement only in a direction parallel tothe bed. The rotation of the eccentric thus displaces the connectingblock 105 and the grinding head slide 103 relatively to the carriage101. Thus the screw and nut mechanism 107, 108 and the connecting block105-form a manually adjustable coupling through which i incorporatingsliding dogs.

the grinding head slide 103 is actuated by the control element oreccentric 110.

The eccentric is formed integrally with a base flange 113, shown moreparticularly in Figs. 3 and 4, which is mounted by means of bolts suchFigs. 1 and 4 are sections on mutually perpendicular planes. tableformed as the head 116 of a shaft 117. The position of the slide 115relatively to the table, 116 may be accurately adjusted by means of amicrometer screw 118 provided at either end with graduated thrustcollars 119 whose graduations cooperate with index marks on bearingblocks 120 mounted on the table 116. A locking strip 121 with lockingbolt 122 enables the slide 115 to be locked in an adjusted position. Themicrometer screw 118 is provided with squared ends which enables it tobe turned by a key when a cover 123 of the housing 109 is removed.

The shaft 117 is vertically mounted on suitable bearend a wormwheel 124which which may be optionally knob 125, with a pinion fixed to the isengaged by a worm engaged, by means of a clutch 126 engaged with a rack127 bed. The clutch is of a conventional type On engaging the clutch andtraversing the carriage along the bed by means of a leadscrew which isnot shown, the shaft 117 and eccentric are rotated to vary thetransverse position of the grinding wheel 104.

as 114 on a slide 115..

The slide is mounted in V slide-ways in a 3. The worm engaging thewormwheel 124 is mounted on a. common shaft with a handwheel 128. Whenthe clutch controlled by the knob 125 is disengaged the eccentric ratelycentered relatively to the head 116; With this adjustment the machinewill grind parallel irrespective to the angular position of the shaft117. For grinding a camber the slide 115 is adjusted by means of thegraduations of the collars 119 to give the required throw of theeccentric. The shaft 117 is turned by means of the handwheel 128 untilthe pointer 130 is aligned with the index mark. As the slide-ways forthe slide 115 are now disposed at right angles to the bed the eccentricwill be in its outermost or outer dead-center position for theadjustment chosen. The carriage is positioned so that the grinding wheelis aligned with the section of the roll at which the crown of the camberis to occur. This will normally be the center. The clutch is now engagedso that movement of the eccentric will be dependent upon the traverse ofthe carriage llll. Finally the carriage is traversed to the point on theroll at which grinding is to be commenced, the desired cut is set by thehandwheel 185 and grinding commenced.

The worm and wheel gear driving shaft. 117 is chosen so that the shaft180 when the carriage is traversed through its normal maximum range,that is the maximum length of roll which 117 will be obtained with acomplete traverse. In this case the eccentricity of the eccentric 110must be calculated in accordance with the desired camber and the actualrotation of the shaft 117 which occurs in a complete traverse of theroll being ground.

The feed screw Hi7 and the nuts 108 form a manually adjustable couplingbetween and in series with the grinding head slide MP3 and the automaticcontrol element or eccentric 110. The adjustable coupling takes part inand transmits the automatic camber adjustments of the eccentric 11hwhilst providing for independent manual adjustment of the grinding headslide 103. The invention thus provides for both manual and automaticadjustment of the grinding head without recourse to an intermediateslide between the grinding head slide and the carriage.

Although the machines herein described are applicable primarily tocamber grinding, that is to say, to the grinding of convex contours,they can nevertheless with suitable adjustment equally be used forreverse camber grinding, that is to say, for the grinding of concavecontours and the scope of the appended claims is to be interpreted toinclude machines according to the present invention when used forreverse camber grinding.

Obviously many changes and modifications may be made without departingfrom the spirit of the invention, and all such changes and modificationsare intended to be included within the scope of the appended claims.

I claim:

1. A camber grinding machine comprising a machine bed, a carriagecapable of being slidably traversed along the bed, a grinding head slidemounted directly on the carriage and capable of being slidably adjustedrela- 117 undergoes a half revolution of longitudinal direction of thebed, a gear transmission mechanism including an upstanding rotatableshaft supported by the carriage and traversible therewith, a toothedrack fixed to the bed and extending over the normal maximum traversingrange of the carriage along the bed, a pinion supported from thecarriage and in mesh with said rack, clutch means for drivablyconnecting and disconnecting said pinion to and from said shaft, a

substantially horizontal table located at the upper end of said shaftand rotatable therewith, said table being provided with a slidewayrunning thereacross, aslide guided by said slideway, an upstanding pinmounted on said slide, means for adjusting said slide relatively to saidslideway to adjust the eccentricity of said pin relatively to the shaft,and a slide block slidabl'e along said downwardly directed guideway andhaving a bearing opening therein. in which said pin is received toenable rotational movement of said pin about the axis of said shaft toeffect transverse adjustment of said grinding head grinding machinecomprising a machine 2. A camber bed, a carriage ment therealong, agrinding carriage so as to be linearly mounted on the bed for traversingmovethe slide transversely of the bed, an automatic control means forlinearly adjusting said slide transversely of the bed arranged in serieswith said manual control means and embodying a rotatable eccentric pin,and. means for rotating the eccentric pin proportionally with, thetraversing movement of the carriage.

3. A camber grinding machine according to claim 2, comprising means foreccentric pin.

4. A camber grinding machine comprising a machine bed, a carriagemounted on the bed for traversing move ment therealong, a grinding headslide mounted on the", carriage so as to be linearly adjustabletransversely of the bed, manual control means for linearly adjusting theslide transversely of the bed, an automatic control means for linearlyadjusting said slide transversely of thebed: arranged in series withsaid manual control means and embodying a rotatable eccentric pinmounted on the carriage for automatically adjusting the slide throughsaid manual control means, and means for rotatingv the eccentric pinproportionally with the traversing move ment of the carriage at a ratesuch that the control element. is turned through not more than as thecarriage moves through its normal traversing range along the bed, andmeans for adjusting the eccentricity of said eccentric pin.

5. A camber grinding machine comprising a machine bed, a carriagemounted on the bed for traversing movement therealong, a grinding headslide mounted on the carriage so as to be linearly adjustabletransversely of the bed, manual control means mounted on the slide forlinear adjustment thereof transversely of the bed, a rotatable controlelement mounted on the carriage in series relationship with said manualcontrol means, and means for rotating the control element proportionallywith said' traversing movement so as to produce an automatic camber feedof the slide transversely of the bed.

6. A camber grinding machine according to claim'S comprising a rotatableturntable which is mounted on the carriage and driven by movement of thecarriage along the bed, and an eccentric pin adjustably mounted on theturntable and forming said rotatable control element.

7. A camber grinding machine according to claim 6 comprising amicrometer screw and a co-operating gradu-' ated scale for accurate adustment of said eccentric pin on said turntable.

8. A camber grinding machine comprising a machine bed, a carriagemounted on the bed for traversing move ment therealong, a toothed rackfixed tothe bed extend: ing over the normal maximum traversing range ofthe head slide mounted on the, adjustable transversely of the bed,manual control means for linearly adjusting adjusting the eccentricityof said,

carriage along the bed, a grinding head slide mounted on the carriage soas to be linearly adjustable transversely of the bed, a rotatableeccentric mounted on the carriage for automatic linear adjustment of theslide transversely of the bed, a pinion supported from the carriage inmesh with said toothed rack, a gear transmission between the pinion andthe rotatable eccentric so that the latter will be rotatedproportionally with the traversing movement of the carriage, and amanually adjustable coupling between and in series relationship with theslide and the rotatable eccentric to provide for manual adjustment ofthe slide transversely of the bed.

References Cited in the file of this patent UNITED STATES PATENTS BrownJuly 23, 1907 Dzus Feb. 26, 1924 Stoner Nov. 20, 1926 Taylor Jan. 7,1930 Grifing Feb, 15, 1938 Wigglesworth Sept. 29, 1942 FOREIGN PATENTSGreat Britain May 24, 1928

